Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds minimal behavioral context beyond that—'Fetch... analytics' essentially restates the read-only nature and introduces the 'Peerlytics' brand without explaining aggregation, pagination, caching, or return behavior. No contradiction with annotations, but also little added transparency.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single short sentence with no filler and the action is front-loaded. It is appropriately concise, though it is so terse that it sacrifices useful context; still, from a purely structural and brevity standpoint it earns a solid score.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the large sibling list, optional nested params, and no output schema, this description is not complete enough for confident tool selection. It does not explain what 'Peerlytics vault analytics' returns, how it differs from peer_vault_list or peer_market_explorer_vault, or what kinds of queries the 'params' object supports.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 100% description coverage for all three parameters, so the baseline of 3 applies. The tool description itself adds no parameter guidance, but the schema describes limit, offset, and the raw params object reasonably well. The phrase 'merged beneath typed fields' is slightly unclear but still provides some semantic signal.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a clear action ('Fetch') and a resource ('Peerlytics vault analytics'), so the agent knows this is a read operation about vault-related analytics. However, it does not distinguish this from many nearby siblings such as peer_vault_list, peer_vault_show, or peer_market_explorer_vault, so the exact purpose remains somewhat ambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to choose this tool over alternatives. The sibling list contains many vault-related and market-related tools, but the description provides no conditions, exclusions, or hints about when 'peer_market_vaults' is the appropriate call.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.